This is what it says...
Rhamnogalacturonan I (RG1) is a Linear polymer of alternating galacturonic acid (GalA) and rhamnose (Rha) molecules
-alpha-Rha-(1-->4)-alpha-GalA-(1-->2)-alpha-Rha-(1-->4)-a-GalA-(1-->2)--etcetc

But shouldn't it be
-alpha-Rha-(1-->2)-alpha-GalA-(1-->4)-alpha-Rha-(1-->2)-a-GalA-(1-->4)--etcetc